Document Detail


Acid-base properties of the alumina surface: influence of the titration procedures on the microcalorimetric results.
MedLine Citation:
PMID:  19643428     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The enthalpy changes associated with the protonation and deprotonation of an alumina surface have been determined on the basis of microcalorimetry experiments and acid-base potentiometric titrations at 25 degrees C. It has been shown that the results may vary significantly according to the experimental procedure. In order to do so, the potentiometric and microcalorimetric titrations have been carried out first from an acidic pH to basic pH and second from a pH near the pH(zpc) of alumina to acidic or basic pH. It has been demonstrated that the pK(a) values deduced from the potentiometric titrations are the same whatever the experimental protocol whereas the only way to obtain meaningful enthalpies of proton exchange is to carry out microcalorimetric titrations by starting around the point of zero charge.
Authors:
Jean-Pierre Morel; Nicolas Marmier; Charlotte Hurel; Nicole Morel-Desrosiers
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-06-30
Journal Detail:
Title:  Journal of colloid and interface science     Volume:  338     ISSN:  1095-7103     ISO Abbreviation:  J Colloid Interface Sci     Publication Date:  2009 Oct 
Date Detail:
Created Date:  2009-08-17     Completed Date:  2009-12-21     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0043125     Medline TA:  J Colloid Interface Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  10-5     Citation Subset:  IM    
Affiliation:
Microorganismes: G??nome et Environnement, UMR CNRS 6023, Universit?? Blaise Pascal, 24 avenue des Landais, 63177 Aubi??re cedex, France.
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MeSH Terms
Descriptor/Qualifier:
Aluminum Oxide / chemistry*
Calorimetry
Hydrogen-Ion Concentration
Microchemistry
Temperature
Titrimetry
Chemical
Reg. No./Substance:
1344-28-1/Aluminum Oxide

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